#include <stdio.h>
#include <string.h>
int my_grep(char *filename, char *expr){

    FILE *file = fopen(filename, "r");
    if(!file) return 2;

    char buffer[2048];
    int found = 0;
    while(fgets(buffer, sizeof(buffer), file)){
        
        if(strstr(buffer, expr) != NULL){
            printf("%s", buffer);

            if(buffer[strlen(buffer) - 1] != '\n') printf("\n");
            
            found ++;
        }
    }
    
    fclose(file);

    if (found != 0) return 1;
    return 0; 
}
/*
int main()
{
    printf("\n%d\n", my_grep("example.txt", "word"));
    // Expected:
    //This line contains words.
    //And "words" contains "word".
    //word
    //1


    putchar('\n');

    printf("%d\n", my_grep("example.txt", "eqlijgber")); // Returns 0
    printf("%d\n", my_grep("empty_file.txt", "word")); // Returns 0
    printf("%d\n", my_grep("inexisting_file.txt", "word")); // Returns 2

    putchar('\n');

    // FLAG
    //Try "grepping" the flag.csv file, by the credit card numbers you found in
    //the previous flag.
    //Then, only keep those which booked several entries.
    
    my_grep("flag.csv", "Put here the credit card numbers");
    my_grep("flag.csv", "Put here the credit card numbers");
    my_grep("flag.csv", "Put here the credit card numbers");
    my_grep("flag.csv", "Put here the credit card numbers");
    my_grep("flag.csv", "Put here the credit card numbers");

    return 0;
}
*/